MediumChemistryHigh School (11–12)Solutions › Solubility, Vapour Pressure and Raoult's LawNumericalAPBoard Exam
The solubility of potassium nitrate is 169 g per 100 g of water at 80 °C and 31.6 g per 100 g of…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The solubility of potassium nitrate is per of water at and per of water at . A factory makes a solution that is saturated at with of water. How much salt does it hold? How many grams of crystals form when it is cooled to ?
Need a reminder? The key ideaShow
The solubility is the mass of solute that dissolves in of solvent at a stated temperature. A saturated solution is in dynamic equilibrium with the undissolved solid. When a saturated solution cools, crystals . For a salt with one cation and one anion, .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The salt at . .
Step 2. The salt that stays at . .
Step 3. Crystals. .
Answer: the solution holds of salt, and of crystals form.
Check. The same answer comes from .
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